“It happened also at Southampton – it is not always sunny. You don’t win always. You get in difficult, tough times and then, really, you need to support each other. That’s important.

“If everything goes well it’s easy to come in the team and play. But we need now really the personalities to turn it around.

“And I think we have enough personalities in the team.”

Everton, who went into the weekend in sixth place in the table, have conceded eight goals and scored 13 in their nine games so far.

They have scored only three in the last four, and Koeman wants to see the Merseyside outfit develop more of a cutting edge in attack, with Romelu Lukaku, who has netted six times in total, receiving more support.

“Overall I am happy about the defensive organisation in the team, but not our offensive aspect,” Koeman said.

“We need to improve and be more clinical. We need to have more productivity.

“It’s a big difference between Romelu and the rest in scoring goals and we need to make that better.”

Koeman is confident Sunday will yield a “good” result against a West Ham side – 15th at the start of the weekend – who have won their last two league games.

“What I have learned is if you are in a tough time, stay calm and do your job,” Koeman said.